Alenco Plastic Vertical Insert for Exterior Side of Window

Good morning. I am looking to replace several pieces of the plastic insert that runs vertically on both exterior sides of our Alenco windows. The color is either black or dark bronze. I have attached a cross sectional drawing with approximate dimensions. Do you carry this item? If not do you by chance have the part number or part description and have any idea where I could buy it?

PS you have previously provided me with the counter balances for the same windows 2 to 3 years ago so you may have additional information on my specific windows in your files.

Thank you very much,

Steve

Casey,

Thank you for your response but please dont leave me hanging. This isn't a balance cover rather it is a plastic snap in cut-to-length jamb insert that is below the upper stationary window on the exterior side of the window. I have searched and searched for what it is called and a possible part number without luck. I do believe it comes in about 6' lengths because when the installers put the Alenco windows in around 2014 they cut one piece to fit well and used the remaining piece that is a out 5" short for the other side.

Please take a second chance on this and see what you can come up with. I would greatly appreciate your support here please.

Thanks in advance.

Steve